Filmed not long after the launch of Russias Sputnik satellite, First Man Into Space benefited from a surface realism made possible by enhanced public knowledge of space-travel jargon and paraphernalia. Dashing astronaut Lt. Dan Prescott (Bill Edwards) disappears from view when his experimental spacecraft vanishes in a mysterious cloud. The space capsule returns to earth, covered in a bizarre extraterrestrial coating. Shortly thereafter, a hulking, half-human creature raids a blood bank, killing the nurse on duty and gulping down the supplies. More bizarre, unexplained events occur before Prescotts older brother Cmdr. C.E. Prescott (Marshall Thompson) concludes that the monster is actually his missing brother, transformed by his experiences in space into a mutant, vampiric beast. ~ Hal Erickson, All Movie Guide